| Abbreviation | Definition |
|---|---|
| IMS | Isotope Measuring System |
| In | Indium |
| INCC | International Nuclear Chemistry Congress |
| InChI | International Chemical Identifier |
| INCT | Institute of Nuclear Chemistry and Technology |
| INF | Iron-Nickel System |
| INGAP | Islet Neogenesis Associated Protein |
| INRTG | Inert Gas |
| IOC | In-Organic Contaminant |
| IOCB | Institute of Organic Chemistry and Biochemistry |
| IOCF | International Organic Chemistry Foundation |
| IOCM | International Organic Chemistry Meeting |
| IOEC | Institute of Ecological Chemistry |
| IP | Immunoprecipitation |
| IPA | IsoPropyl Alcohol |
| IPBC | IodoproPargyl Butyl Carbamate |
| IPC | Integrated Physics Chemistry |
| IPEN | International Pollutant Elimination Network |
| IPTG | IsoPropyl b-D-ThioGalactoside |
| IQ | Ion Quality |